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DLL 的静态调用实例代码

作者:admin 来源: 日期:2020/11/6 8:11:58 人气: 标签:

 
自己写了一MinMax.dll文件 里面定义了2个函数Min、Max
在测试中使用了静态调用的方法


 
完整代码如下:
----------------------------------------
unit unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, Buttons;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Button1: TButton;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
    procedure BitBtn1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation


{$R *.dfm}
uses unit3;
function min(x,y:integer):integer;stdcall; external 'Minmax.dll' name 'Min';
function max(x,y:integer):integer;stdcall; external 'Minmax.dll' name 'Max';

procedure TForm1.Button1Click(Sender: TObject);
var
  x,y,mi,ma:integer;
begin
  if (edit1.Text ='') or (edit2.Text ='') then
    showmessage('X或Y值为空!')
  else
  begin
    x:=strtoint(trim(edit1.Text) );
    y:=strtoint(trim(edit2.Text) );
    mi:=min(x,y);
    ma:=max(x,y);
    Memo1.Lines.Clear ;
    Memo1.Lines.Add ('最小值:'+inttostr(mi));
    Memo1.Lines.Add ('最大值:'+inttostr(ma));
  end;
end;

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
  Form3:=TForm3.Create(Form1);
  Form3.ShowModal ;
end;

end.

-----------------------------------

MinMax.dll文件源码如下:

 

library Minmax;

{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }

uses
  SysUtils,
  Classes;

{$R *.res}
function Min(x,y:integer):integer;stdcall ;
begin
  if (x<y) then
    Min:=x
  else
    Min:=y;
end;

function Max(x,y:integer):integer;stdcall ;
begin
  if (x>y) then
    Max:=x
  else
    Max:=y;
end;
exports Min,Max;
begin
end.
------------------------------

 https://blog.csdn.net/rshhs/article/details/4767997